R Learner

Allows execution of R command to build a R model in a local R installation. The model is returned in the output port and can be used by the R Predictor node to predict unseen data. All input data is written to a CSV file, imported into R (saved in the variable named R) and processed together with the R commands. The final model must be returned as variable called R.

More details about R:
http://www.r-project.org/
Short-refcard.pdf

Options

R Command

R Snippet

The R commands to run.

Column List

The list contains the column that are available in the input table. Double click any of the column names to insert the respective field in the expression editor. It will replace your current selection or simply insert at the current caret position.

Flow Variable List

The list contains the flow variables that are currently available at the node input. Double clicking any of the entries will insert the respective identifier at the current cursor position (replacing the selection, if any).

R Binary

R binary path

Path to the local R executable. Note that it is possible to specify the path to the local R executable also in the R section of the KNIME preferences.

Arguments for R binary

Add additional arguments run together with the R binary. The '--vanilla' mode ensures a clean workspace and may cause problems when removed.

Override default

If checked, the specified file is used as R binary. If not checked, the file specified in the KNIME's R preferences is used.

Views

R Std Output

The text sent to standard out during the execution of R executable as well as the text of the .Rout file generated by R.

R Error Output

The text sent to standard error during the execution of R executable as well as the text of the .Rout file generated by R. (If it appears in gray, it's the output of a previously failing run which is preserved for your trouble shooting.)

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Developers